Energy absorption type waterborne polyurethane glue as well as preparation method and application thereof

Abstract

The invention provides energy absorption type waterborne polyurethane glue as well as a preparation method and application thereof, and belongs to the field of glue for automobiles, the energy absorption type waterborne polyurethane glue is prepared from the following raw materials: a matrix polymer, a toughening material, an energy absorption reinforcing material, a plasticizer, a cross-linking agent and water, the matrix polymer is anionic aliphatic waterborne polyurethane; and the weight-average molecular weight of the anionic aliphatic waterborne polyurethane is 65000 to 80000. The energy absorption type waterborne polyurethane glue can effectively absorb and disperse impact energy under the action of external force, and during collision, the glue can slow down the transmission of impact force by changing the form, generating microscopic deformation or releasing internal energy, so that the damage of collision to a vehicle body is effectively reduced. And the waterborne polyurethane glue has the characteristics of low VOC emission and no solvent pollution, meets the environmental protection requirement, and is suitable for the green manufacturing standard of the automobile industry.

Description

Technical Field

[0001] The present invention belongs to the field of adhesives for automobiles, and relates to an energy-absorbing waterborne polyurethane adhesive, a preparation method thereof, and an application thereof. Background Art

[0002] With the improvement of the demand for automotive safety, the body structure and collision energy absorption technology have received extensive attention. In the automotive industry, to improve the collision safety of automobiles, energy-absorbing materials are often used to reduce the energy transfer during collisions. Existing adhesives for automobiles mainly provide bonding and structural support. However, during collisions, these adhesives usually cannot effectively disperse the impact force or absorb energy, so the effect of reducing damage during collisions is limited. Currently, most adhesives are used for static connections, and most designs do not consider the problem of energy dispersion under dynamic impacts. To improve the safety of automobiles during collisions, especially in positions such as doors and roofs, there is an urgent need for an energy-absorbing polyurethane adhesive, which can absorb the impact force through its bonding and buffering characteristics, thereby reducing the damage to the vehicle body during the collision. Summary of the Invention

[0003] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide an energy-absorbing waterborne polyurethane adhesive for automobiles, a preparation method thereof, and an application thereof.

[0004] To achieve this purpose, the present invention adopts the following technical solutions:

[0005] On the one hand, the present invention provides an energy-absorbing waterborne polyurethane adhesive. The preparation raw materials of the energy-absorbing waterborne polyurethane adhesive include a matrix polymer, a toughening material, an energy absorption enhancement material, a crosslinking agent, and water. The matrix polymer is an anionic aliphatic waterborne polyurethane; the weight average molecular weight of the anionic aliphatic waterborne polyurethane is 65,000 - 80,000.

[0006] In the present invention, the matrix polymer can provide basic elasticity and bonding performance. Cooperating with the toughening material can enhance the flexibility and deformation ability of the adhesive, increase the flexibility and extensibility of the molecular chain, help form effective plastic deformation during the impact process, and absorb the impact energy. Adding the energy absorption enhancement material can significantly improve the energy absorption ability. The use of a plasticizer can improve the flexibility of the adhesive, keep good adhesion and adaptability at low temperatures, and avoid becoming brittle at low temperatures; the use of a crosslinking agent can enhance the durability and structural stability of the adhesive, effectively increase the mechanical strength of the adhesive, and control its curing speed. The waterborne polyurethane adhesive prepared from the preparation raw materials of the present invention can effectively absorb energy when an external force impacts, reduce the damage to vehicle body parts, and help improve the safety of passengers in the vehicle.

[0007] Preferably, the matrix polymer is an anionic aliphatic waterborne polyurethane.

[0008] In the present invention, an anionic aliphatic aqueous polyurethane is used as the matrix polymer. Due to its excellent elasticity and adhesion properties, it can provide good impact energy absorption and heat resistance.

[0009] In the present invention, the weight-average molecular weight of the anionic aliphatic aqueous polyurethane is 65,000 - 80,000, such as 65,000, 68,000, 70,000, 73,000, 75,000, 78,000 or 80,000.

[0010] Preferably, the matrix polymer is selected from any one or a combination of at least two of PU650, PU550, U54 or 42B.

[0011] Preferably, the toughening material is selected from any one or a combination of at least two of polyethers, polyols or rubber particles. These toughening materials can enhance the flexibility and deformation ability of the glue, increase the flexibility and extensibility of the molecular chains, and help form effective plastic deformation during impact to absorb impact energy.

[0012] Preferably, the polyether is polypropylene glycol.

[0013] Preferably, the polyol is polybutylene adipate.

[0014] Preferably, the energy absorption enhancing material is selected from any one or a combination of at least two of nano-scale rubber, aerogel, microbubble spheres or ultra-fine fibers.

[0015] Preferably, the cross-linking agent is an isocyanate, and the isocyanate is selected from any one or a combination of at least two of hexamethylene diisocyanate trimer, hexamethylene diisocyanate biuret or hexamethylene diisocyanate uretdione.

[0016] Preferably, the raw materials for preparing the energy absorption type aqueous polyurethane glue include the following components in parts by weight:

[0017] Matrix polymer 60 - 70 parts (such as 60 parts, 63 parts, 65 parts, 68 parts or 70 parts), toughening material 5 - 10 parts (such as 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts), energy absorption enhancing material 5 - 40 parts (such as 5 parts, 8 parts, 10 parts, 15 parts, 18 parts, 20 parts, 25 parts, 30 parts, 35 parts or 40 parts), cross-linking agent 3 - 8 parts (such as 3 parts, 4 parts, 5 parts, 6 parts, 7 parts or 8 parts) and water 4 - 10 parts (such as 4 parts, 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts).

[0018] Preferably, the raw materials for preparing the energy absorption type aqueous polyurethane glue further include a plasticizer;

[0019] Preferably, the plasticizer is diisooctyl phthalate, trioctyl citrate, etc. These plasticizers can enable the glue to maintain good adhesion and adaptability at low temperatures and prevent it from becoming brittle at low temperatures.

[0020] Preferably, the content of the plasticizer in the preparation raw materials is 3 - 5 parts by weight, such as 3 parts, 3.5 parts, 4 parts, 4.5 parts or 5 parts.

[0021] Preferably, the viscosity of the energy - absorbing water - borne polyurethane glue at 25°C is 7000 - 8000 m.pas, such as 7000 m.pas, 7300 m.pas, 7500 m.pas, 7800 m.pas or 8000 m.pas.

[0022] On the other hand, the present invention provides a method for preparing the energy - absorbing water - borne polyurethane glue as described above, and the preparation method includes the following steps:

[0023] Mix the dispersion of the matrix polymer with the toughening material, add the energy - absorbing reinforcement material to the mixture, and then add the cross - linker, optional plasticizer and water, and mix evenly to obtain the energy - absorbing water - borne polyurethane glue.

[0024] In the present invention, the mixing is carried out at room temperature.

[0025] On the other hand, the present invention provides an application of the energy - absorbing water - borne polyurethane glue as described above in automobiles.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] The energy - absorbing water - borne polyurethane glue of the present invention can effectively absorb and disperse impact energy under external force. When colliding, the glue can slow down the transmission of the impact force by changing its shape, generating microscopic deformation or releasing internal energy, thereby effectively reducing the damage to the vehicle body caused by the collision. And the water - borne polyurethane glue of the present invention has the characteristics of low VOC (volatile organic compound) emissions and no solvent pollution, meets the environmental protection requirements, and is applicable to the green manufacturing standards of the automotive industry. Description of the Drawings

[0028] Figure 1 The deformation situation of the test sample obtained from the glue prepared in Example 1 under the impact of a 0.1 kg rubber ball.

[0029] Figure 2 For the deformation situation of the test sample obtained from the glue prepared in Example 1 under the impact of a 0.2 kg rubber ball.

[0030] Figure 3The deformation of the test sample obtained from the glue prepared in Example 1 under the impact of a 0.3 kg rubber ball.

[0031] Figure 4 For Figure 1 A side view of the sample deformation shown.

[0032] Figure 5 For Figure 2 A side view of the sample deformation shown.

[0033] Figure 6 For Figure 3 A side view of the sample deformation shown. Detailed implementation mode

[0034] The technical solution of the present invention will be further described below through specific implementation modes. Those skilled in the art should understand that the described embodiments are only helpful for understanding the present invention and should not be regarded as specific limitations on the present invention.

[0035] Example 1

[0036] This example provides an energy-absorbing waterborne polyurethane glue. The raw materials for preparing the energy-absorbing waterborne polyurethane glue include the following components in parts by weight:

[0037] Anionic aliphatic waterborne polyurethane (Haoyi PU650, weight average molecular weight of 65,000) 60 parts, polyether toughening agent 8 parts (Arkema product: XT100), nano rubber particles 8 parts (Narpow VP-301 of Beijing Institute of Chemistry), aerogel particles 8 parts (Cabot Corporation, product model: ENOVAAEROGEL MT1200), microcapsule synergist (phase change microcapsules of Wuhan Zhongke Advanced Materials Technology Co., Ltd.) 5 parts, hexamethylene diisocyanate trimer (Covestro 2655) 5 parts, deionized water 5 parts.

[0038] The preparation process of the energy-absorbing waterborne polyurethane glue is as follows:

[0039] In a container, an anionic aliphatic aqueous polyurethane PU650 dispersion (solid content: 50%) was added. A polyether toughening agent was added to the aqueous polyurethane dispersion and stirred evenly until completely dissolved. Nano rubber particles were gradually added to the above system and stirred evenly. Then, aerogel particles were added and stirring was continued to ensure uniform mixing. A microcapsule synergist was slowly added dropwise to the above mixture to avoid skin formation due to too fast dropping. Then, deionized water was added and stirred evenly. After all the raw materials were well mixed, it was left standing for 1 hour. At 25°C, the viscosity of the glue was measured to be 7300 m.pas using a rotational viscometer (3#, 12r).

[0040] Example 2

[0041] Different from Example 1, the raw materials for preparing the energy-absorbing aqueous polyurethane glue include the following components in parts by weight:

[0042] 70 parts of an aqueous polyurethane dispersion (42B, weight average molecular weight: 68000), 10 parts of a polyether toughening agent (product of Arkema: XT100), 5 parts of nano rubber particles (VP-301 of Narpow, Beijing Institute of Chemistry), 5 parts of aerogel particles (product model: ENOVA AEROGEL MT1200 of Cabot Corporation), 10 parts of a microcapsule synergist (phase change microcapsule of Wuhan Zhongke Advanced Materials Technology Co., Ltd.), 5 parts of hexamethylene diisocyanate trimer (Covestro 2655), and 5 parts of deionized water. The viscosity of the obtained glue was measured to be 7450 m.pas at 25°C using a rotational viscometer (3#, 12r).

[0043] Example 3

[0044] Different from Example 1, the raw materials for preparing the energy-absorbing aqueous polyurethane glue include the following components in parts by weight:

[0045] 80 parts of an anionic aliphatic aqueous polyurethane (Haoyi PU650, weight average molecular weight: 65000), 5 parts of a polyether toughening agent (product of Arkema: XT100), 10 parts of nano rubber particles, 10 parts of aerogel particles (product model: ENOVA AEROGEL MT1200 of Cabot Corporation), 10 parts of a microcapsule synergist (phase change microcapsule of Wuhan Zhongke Advanced Materials Technology Co., Ltd.), 5 parts of hexamethylene diisocyanate trimer (Covestro 2655), and 5 parts of deionized water. The viscosity of the obtained glue was measured to be 7820 m.pas at 25°C using a rotational viscometer (3#, 12r).

[0046] Example 4

[0047] This example provides an energy-absorbing waterborne polyurethane glue. The raw materials for preparing the energy-absorbing waterborne polyurethane glue include the following components in parts by weight:

[0048] 70 parts of anionic aliphatic waterborne polyurethane (PU550, weight average molecular weight of 75,000), 5 parts of polyol (Wanhua, WHP-H6), 5 parts of nano rubber particles (VP-301 from Beijing Institute of Chemistry (Narpow)), 5 parts of hexamethylene diisocyanate biuret (Covestro, N3200), 5 parts of plasticizer dioctyl phthalate, 10 parts of deionized water. The viscosity of the obtained glue was measured at 25 °C using a rotational viscometer (3#, 12r) and was 7310 m.pas.

[0049] The preparation process of the energy-absorbing waterborne polyurethane glue is as follows:

[0050] In a container, add an anionic aliphatic waterborne polyurethane dispersion (solid content 50%). Add the polyether toughening agent to the waterborne polyurethane dispersion and stir evenly until completely dissolved. Gradually add the nano rubber particles to the above system and stir evenly. Add the plasticizer and stir evenly. Then add deionized water and stir evenly. After mixing all the raw materials, let it stand for 1 hour. The viscosity of the obtained glue was measured at 25 °C using a rotational viscometer (3#, 12r) and was 7910 m.pas.

[0051] Example 5

[0052] This example provides an energy-absorbing waterborne polyurethane glue. The raw materials for preparing the energy-absorbing waterborne polyurethane glue include the following components in parts by weight:

[0053] 60 parts of anionic aliphatic waterborne polyurethane (U54, weight average molecular weight of 68,000), 10 parts of polyol (Wanhua, WHP-H6), 25 parts of aerogel particles (Cabot Corporation, product model: ENOVA AEROGEL MT1200), 5 parts of hexamethylene diisocyanate uretdione (Covestro N3400), 3 parts of plasticizer dioctyl phthalate, 10 parts of deionized water.

[0054] The preparation process of the energy-absorbing waterborne polyurethane glue is as follows:

[0055] In a container, an anionic aliphatic aqueous polyurethane dispersion (solid content 50%) was added. A polyether toughening agent was added to the aqueous polyurethane dispersion and stirred evenly until completely dissolved. Aerogel particles were gradually added to the above system and stirred evenly. A plasticizer was added and stirred evenly. Then deionized water was added and stirred evenly. After all the raw materials were mixed well, it was left standing for 1 hour. The viscosity of the obtained glue was measured at 25°C using a rotational viscometer (3#, 12r) and was 7550 m.pas.

[0056] Example 6

[0057] This example provides an energy-absorbing aqueous polyurethane glue. The preparation raw materials of the energy-absorbing aqueous polyurethane glue include the following components in parts by weight:

[0058] 60 parts of anionic aliphatic aqueous polyurethane (42B), 10 parts of polyether (product of Arkema: XT100), 10 parts of nano rubber particles (VP-301 of Narpow, Beijing Institute of Chemistry), 15 parts of aerogel particles (product model: ENOVA AEROGEL MT1200 of Cabot Corporation), 5 parts of hexamethylene diisocyanate trimer (Covestro 2655), 4 parts of plasticizer dioctyl phthalate, and 8 parts of deionized water.

[0059] The preparation process of the energy-absorbing aqueous polyurethane glue is as follows:

[0060] In a container, an anionic aliphatic aqueous polyurethane dispersion (solid content 50%) was added. A polyether toughening agent was added to the aqueous polyurethane dispersion and stirred evenly until completely dissolved. Nano rubber particles were gradually added to the above system and stirred evenly. Then aerogel particles were added and stirring was continued to ensure uniform mixing. Then a plasticizer was added and stirred evenly. Then deionized water was added and stirred evenly. After all the raw materials were mixed well, it was left standing for 1 hour. The viscosity of the obtained glue was measured at 25°C using a rotational viscometer (3#, 12r) and was 7040 m.pas.

[0061] Comparative Example 1

[0062] Compared with Example 4, the only difference is that the preparation raw materials do not include nano rubber particles.

[0063] Comparative Example 2

[0064] Compared with Example 4, the only difference is that the dosage of nano rubber particles is 2 parts by weight.

[0065] Comparative Example 3

[0066] Compared with Example 1, the only difference is that the preparation raw materials do not include polyether toughening agent.

[0067] Comparative Example 4

[0068] Compared with Example 1, the only difference is that the preparation raw materials do not include nano rubber particles and microcapsule synergist.

[0069] Comparative Example 5

[0070] Compared with Example 1, the only difference is that the anionic aliphatic waterborne polyurethane is replaced with witcobond386 - 03 (weight - average molecular weight 45000).

[0071] For the adhesives obtained from the above - mentioned examples and comparative examples, performance tests were carried out, and the test methods are as follows:

[0072] (1) Energy absorption function test

[0073] Test method:

[0074] 1. Substrate: Metal plate (aluminum alloy, thickness 2 mm), each metal plate is coated with a water - based adhesive layer (thickness 1 mm), specimen size: 100 mm×100 mm.

[0075] 2. Test equipment: Use an impact testing machine, which can set different impact energies. Set the impact energies to 10 J, 20 J, and 30 J respectively. A laboratory high - speed camera, with ultra - high frame rate continuous shooting, analyzes the object's motion trajectory through slow - motion playback, and then calculates the height of the falling hammer's rebound.

[0076] 3. Test process: In each test, rubber balls with masses of 0.1 kg, 0.2 kg, and 0.3 kg are freely dropped from a height of 1 m to impact the test samples. Record the deformation conditions after each impact, including cracks and ruptures in the adhesive layer. Use the laboratory high - speed camera to record the height of the falling hammer's rebound after each impact, and calculate the kinetic energy loss, that is, the absorbed amount of impact energy.

[0077] According to the law of conservation of kinetic energy, Neglecting the influence of air resistance, in the process of the falling hammer's free - fall, let the height be h, and in each rebound process, let the indentation thickness of the tested object be h0 and the rebound height be h2. Only gravity does work, then Then Integrated formula: Energy absorption rate %=(h - h2) / (h + h0)×100%, record the height of each falling hammer's free - fall and rebound, conduct 3 tests for each impact energy respectively, and calculate the average energy absorption effect.

[0078] 4. Evaluation Criteria: An ideal water-based glue should be able to absorb at least 40% to 60% of the impact energy during the impact process. Plastic deformation of the glue layer should prevent the propagation of cracks or fractures, ensuring structural stability even at higher impact energies.

[0079] The test results are shown in Table 1 below.

[0080] Table 1

[0081]

[0082] It can be seen from the data that the glues of Examples 1-6 exhibit excellent energy absorption capabilities at various impact energies. Especially at higher impacts, the energy absorption rate exceeds 50%, and the glue layer can maintain its structural stability within a large deformation range without complete rupture.

[0083] Among them, the deformation of the test samples obtained with the glue of Example 1 under the impact of a 0.1 kg rubber ball is as Figure 1 shown, and the deformation of the test samples under the impact of a 0.2 kg rubber ball is as Figure 2 shown, and the deformation of the test samples under the impact of a 0.3 kg rubber ball is as Figure 3 shown. It can be seen that although there is deformation under the energy impact, the glue layer deforms uniformly without rupture. Measuring the depression thickness in the product deformation, as Figure 4 is the side view of the sample deformation under the impact of a 0.1 kg rubber ball (i.e., Figure 1 ), where the measured depression thickness is 1.0 mm, Figure 5 is the side view of the sample deformation under the impact of a 0.2 kg rubber ball (i.e., Figure 2 ), and the measured depression thickness is 2.0 mm, Figure 6 is the side view of the sample deformation under the impact of a 0.3 kg rubber ball (i.e., Figure 3 ), and the measured depression thickness is 3.0 mm.

[0084] (2) Impact Mitigation Effect

[0085] Test Method:

[0086] 1. Substrate: Prepare two groups of samples: one group is the samples coated with energy-absorbing water-based glue (Examples 1-6 and Comparative Examples 1-5), and the other group is the control group without glue coating (same substrate and size). Aluminum is used as the substrate, and the thickness of the coated glue layer is 1 mm.

[0087] 2. Test Equipment: Drop Tower Impact Tester: used to simulate the instantaneous impact in vehicle collisions; acceleration and force sensors are used to record and analyze the changes in impact force and acceleration at different positions during the collision. It is used to capture the deformation of the glue during the collision and its shock wave mitigation effect.

[0088] 3. Test Process: Experiments are conducted using the Drop Tower Impact Tester, setting different impact energies to simulate different impact intensities in actual vehicle collisions. After each collision simulation, the waveform of the impact force, the feedback of the force sensor, the deformation of the sample, and the specific data on the reduction of the impact force are recorded.

[0089] 4. Evaluation Criteria: The glue should be able to significantly reduce the transmission of the shock wave by 20 - 30% during the impact, reducing the impact on downstream components. The glue layer should maintain a low crack propagation rate and a small material damage area.

[0090] The test results are shown in Tables 2-1 to 2-11.

[0091] Table 2-1 Example 1

[0092]

[0093] Table 2-2 Example 2

[0094]

[0095] Table 2-3 Example 3

[0096]

[0097] Table 2-4 Example 4

[0098]

[0099] Table 2-5 Example 5

[0100]

[0101] Table 2-6 Example 6

[0102]

[0103] Table 2-7 Comparative Example 1

[0104]

[0105] Table 2-8 Comparative Example 2

[0106]

[0107] Table 2-9 Comparative Example 3

[0108]

[0109] Table 2-10 Comparative Example 4

[0110]

[0111] Table 2-11 Comparative Example 5

[0112]

[0113] From the above test data, it can be seen that the energy-absorbing water-based glue shows significant advantages in impact mitigation. Whether under low-speed collision (10 J) or high-speed collision (50 J), the glued samples can effectively slow down the transmission of the impact force, reduce component damage, and improve the safety of the vehicle body structure.

[0114] By introducing key components such as anionic aliphatic waterborne polyurethane dispersions, energy absorption enhancement materials, plasticizers, and crosslinking agents into the formulation, the present invention has successfully improved the performance of the waterborne polyurethane glue. These test results show that the waterborne glue of the present invention has good energy absorption and impact mitigation effects, can effectively enhance the safety of automotive components in collisions, reduce damage, and improve the collision protection of the vehicle body, and is particularly suitable for the requirements of impact safety in the automotive manufacturing process.

[0115] The applicant declares that the present invention uses the above embodiments to illustrate the energy-absorbing waterborne polyurethane glue of the present invention and its preparation method and application, but the present invention is not limited to the above embodiments, that is, it does not mean that the present invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent replacement of each raw material of the product of the present invention, the addition of auxiliary components, and the selection of specific methods, etc., all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. An energy-absorbing aqueous polyurethane glue, characterized in that The raw materials for preparing the energy-absorbing aqueous polyurethane glue include a matrix polymer, a toughening material, an energy-absorbing reinforcing material, a cross-linking agent, and water; the matrix polymer is an anionic aliphatic aqueous polyurethane; the weight-average molecular weight of the anionic aliphatic aqueous polyurethane is 65,000 - 80,000.

2. The energy-absorbing aqueous polyurethane glue according to claim 1, wherein The matrix polymer is selected from any one or a combination of at least two of PU650, PU550, U54, or 42B.

3. The energy-absorbing aqueous polyurethane glue according to claim 1, wherein The toughening material is selected from any one or a combination of at least two of polyethers, polyols, or nano-silica; The polyether is polypropylene glycol, and the polyol is polybutylene adipate.

4. The energy-absorbing aqueous polyurethane glue according to claim 1, wherein The energy-absorbing reinforcing material is selected from any one or a combination of at least two of nano-rubber, aerogel, microbubble spheres, or ultrafine fibers.

5. The energy-absorbing aqueous polyurethane glue according to claim 1, characterized in that, The cross-linking agent is isocyanate, and the isocyanate is selected from any one or a combination of at least two of hexamethylene diisocyanate trimer, hexamethylene diisocyanate biuret, or hexamethylene diisocyanate uretidione.

6. The energy-absorbing aqueous polyurethane glue according to claim 1, wherein The raw materials for preparing the energy-absorbing aqueous polyurethane glue include the following components in parts by weight: 60 - 70 parts of matrix polymer, 5 - 10 parts of toughening material, 5 - 40 parts of energy-absorbing reinforcing material, 3 - 8 parts of cross-linking agent, and 4 - 10 parts of water.

7. The energy-absorbing aqueous polyurethane glue according to claim 1, characterized in that, The raw materials for preparing the energy-absorbing aqueous polyurethane glue further include a plasticizer; The plasticizer is dioctyl phthalate and / or trioctyl citrate, The content of the plasticizer in the preparation raw materials is 3 - 5 parts by weight.

8. The energy-absorbing aqueous polyurethane glue according to claim 1, characterized in that The viscosity of the energy-absorbing aqueous polyurethane glue at 25 °C is 7000 - 8000 m.pas.

9. The preparation method of the energy-absorbing aqueous polyurethane glue according to any one of claims 1-8, characterized in that, The preparation method includes the following steps: Mix the dispersion of the matrix polymer with the toughening material, add the energy-absorbing reinforcing material to the mixture, and then add the cross-linking agent, optional plasticizer, and water, and mix evenly to obtain the energy-absorbing aqueous polyurethane glue.

10. The application of the energy-absorbing aqueous polyurethane glue according to any one of claims 1 - 8 in an automobile.

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